- Sep 2015
The name Vortigurn appears on Ogham stones in Ireland. I think there are two examples. Off the top of my head there is one in Waterford and one in Kerry. There was also a bishop called Fortichern ( a Gaelic rendering of Vortigern) associated with Trim in Co. Meath who was said to be a disciple of Patrick.A similar argument often made is that since Vortigern means high lord it must have been a title and not a name.
I never heard of the nickname of "the Twister" for Aethelfrith. I have always read his nickname, when given, to be "the Destroyer". And here is a site mentioning Aethelfrith the Destroyer: Aethelfrith | king of Bernicia and Deira
The name of Maglocunus is not only known from literary sources. Frank D. Reno in The historic King Arthur or Arthurian Figures of History and Legend mentions the name of Maglocunus in an inscribed stone in a Welsh church, and there is another inscribed stone about a man described as a citizen of Gwynedd and cousin of Maglos the Magistrate, Maglos being considered a version of Maglocunus.
The Maglocunas stone is in Nevern in Pembrokeshire and it is also carved in Ogham which would suggest he had an Irish heritage.